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Explain the composition and formation of Super-sequence 'A' in Oman.
Explain the composition and formation of Super-sequence 'A' in Oman.
Super-sequence 'A' in Oman consists of rocks forming the continental crust and the sediments above it which were present before the opening of the Tethys Ocean. It includes pre-Permian rocks (older than 600 million years) and shallow water carbonates deposited on the Arabian platform as a result of the opening of the Tethys Ocean.
What are the key characteristics of Super-sequence 'B' in Oman?
What are the key characteristics of Super-sequence 'B' in Oman?
Super-sequence 'B' in Oman consists of rocks formed away from the continental edge, including those from the slope and into the deep oceanic floor as well as the Tethyan oceanic crust (Ophiolite).
Describe the rocks that form Super-sequence 'C' in Oman and their formation timeline.
Describe the rocks that form Super-sequence 'C' in Oman and their formation timeline.
Super-sequence 'C' in Oman consists of rocks formed after the closure of the Tethys Ocean and the arrival of the ophiolite. These rocks are shallow marine limestones and referred to as Tertiary rocks. The formation timeline is from 65 to 2 million years ago.
What are the main components of Super-sequence 'A' in Oman and how do they differ from Super-sequence 'B'?
What are the main components of Super-sequence 'A' in Oman and how do they differ from Super-sequence 'B'?
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Provide a brief overview of the tectono-stratigraphy of Oman, including the key super-sequences and their corresponding rock formations.
Provide a brief overview of the tectono-stratigraphy of Oman, including the key super-sequences and their corresponding rock formations.
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Study Notes
Super-sequence 'A' in Oman
- Composed of various geological formations including limestone, sandstone, and shale.
- Established during the Late Precambrian to Early Paleozoic era.
- Characterized by significant transgressive sequences and associated with marine environments.
- Contains evidence of early reef systems and diverse fossil assemblages.
Super-sequence 'B' in Oman
- Dominated by thicker sequences of clastic rocks and carbonate deposits.
- Formed predominantly during the Mesozoic era, showing extensive marine transgressions.
- Significant stratigraphic features include angular unconformities and distinctive sedimentary structures.
- Rich in fine-grained sediments that hint at deltaic and shallow marine depositional environments.
Super-sequence 'C' in Oman
- Comprises mainly of evaporites, dolomites, and anhydrites.
- Formed during the Late Paleozoic to Mesozoic era, showcasing a different environmental setting.
- Indicative of arid conditions with sedimentation influenced by climatic changes.
- Contains important mineral resources, notably salt and petroleum deposits.
Comparison of Super-sequence 'A' and 'B'
- Super-sequence 'A' features early marine sediments while 'B' displays more varied clastic and carbonate deposits.
- Differences are also seen in thickness, with 'B' typically featuring thicker sedimentary sequences.
- Super-sequence 'A' presents early reef formations, contrasting with the extensive clastic facies of 'B.'
Tectono-stratigraphy of Oman
- The region showcases a multi-layered geological profile encompassing three main super-sequences: A, B, and C.
- Key formations include the Hawasina Nappes, representing a complex fold-thrust belt.
- The stratigraphy reflects tectonic movements from the Late Precambrian to present, influencing sedimentation patterns.
- Overall, the area demonstrates significant geological diversity, contributing to its rich natural resources, including hydrocarbons.
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Description
Explore the geological record of Oman, focusing on Super-sequences A, B, and C. Learn about the formation of continental crust, sediments, and shallow water carbonates in the region.
